Run your whole business in one system, without licence fees.
eYssen is a complete business management system for small and medium-sized companies: accounting, sales, webshop, warehouse, HR and more, with Hungarian, Spanish and Romanian rules built in. The software is free: run it yourself, or let us host and support it and pay only for the servers and services.
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Official Odoo Partner 2018–2025
100+ business systems operated by us
1000+ self-hosted open-source systems
Everything your business runs on, in one place.
Stop juggling separate tools for invoicing, stock, sales and HR. eYssen connects them, so every team works from the same data.
Finance & Accounting
Invoicing, bank reconciliation, financial reports and local tax reporting, with no Enterprise licence.
Learn moreSales & CRM
Pipeline, quotations, pricelists, subscriptions and commissions in one flow.
Learn moreWebshop
An online shop on the same database, with real stock, EU pricing rules and marketplace connectors.
Learn moreWarehouse & Logistics
Multi-warehouse stock, barcode scanning and carrier labels.
Learn moreProjects & Service
Projects, helpdesk with SLAs and field service, invoiced from timesheets.
Learn moreHR
Employee records, performance reviews and objectives.
Learn moreWhy growing companies choose eYssen.
A business system should grow with you, not charge you more for every new colleague or every feature you switch on.
Free software, fair services
Run eYssen yourself at no cost. If we run it for you, you pay for servers, backups and support, which we pay our partners for too, not for the software.
One connected system
Sales, stock, invoicing and HR share the same data, so nothing is typed twice.
Local rules built in
NAV Online Számla in Hungary, SII and Veri*Factu in Spain, RO e-Factura and SAF-T in Romania.
Hosted and supported by us
Backups, updates and monitoring on the eYssen Cloud, with a team that knows your system.
No lock-in
Open-source code and your own data. You can always take both with you.
Proven foundations
Built on Odoo, one of the most widely used open-source business platforms, and on the work of the OCA community.
Ready for your country, wherever you are.
Tax rules and e-invoicing are built in for Hungary, Spain and Romania, and eYssen works in any other country too. We keep local rules up to date when they change.
NAV Online Számla and full Hungarian accounting.
Every invoice reported to NAV, returns for your accountant and auditor data exports, ready from day one.
SII and Veri*Factu ready, ahead of the 2027 deadlines.
Spanish accounting, AEAT returns, SII, Veri*Factu, SEPA remittances and Spanish bank sync, all working today.
Verifactu: mandatory from 2027RO e-Factura, SAF-T and the ANAF returns.
Romanian accounting, RO e-Factura and e-Transport, D300, D390, D394 and D406 from your own accounts, with official validation.
Any other country
Over 100 country localisations, multi-currency and multi-company accounting, and EU OSS VAT for cross-border sales.
We speak your language. On calls we work in English, Hungarian and Spanish, and some German. In writing, we support you in any language.
From first call to go-live in three steps.
You do not need an IT department. We guide you from the first conversation to the day your team works in eYssen.
Free demo and consultation
We look at how you work today and show eYssen on your own processes.
Setup and data import
We configure the system, import your customers, products and opening balances, and connect the tools you already use.
Go live with training
Your team gets trained, and we stay with you with support and continuous improvements.
AI where it saves you time.
AI is part of the system you work in every day, and our AI team helps you take it further across your whole company.
AI inside eYssen
Built into the ERP, with your data staying under your control.
- AI invoice scanning: supplier bills read into drafts
- An AI platform to connect providers and build your own agents
- Every AI call logged and access-controlled
eYssen AI services
Our AI business helps companies automate processes and put AI agents to work.
- AI automation of everyday processes
- Autonomous AI agents
- AI audit and governance
Choosing your first ERP, or switching from another one?
Whether you are outgrowing spreadsheets and separate apps, or moving away from another ERP or Odoo Enterprise, we bring your data across and get your team up and running.
Starting fresh
From spreadsheets and separate apps to one system. We set it up with you and import what you already have.
Switching from another system
Customers, products, open invoices and balances imported from your current ERP or accounting software.
Moving from Odoo Enterprise
eYssen is built on Odoo Community, so your data and workflows move over. Keep your data, drop the licence.
Hosted, backed up and looked after.
Your system runs on our own cloud platform. We take care of updates, backups and monitoring, so you can focus on your business. You pay a subscription for the servers and services, never for a software licence.
Automatic backups
Continuous backup with point-in-time recovery.
High availability
Automatic failover and self-healing infrastructure.
VS Code in your browser
Web-based Visual Studio Code, shell and database access for your developers.
Scales with you
More CPU and memory without downtime.
Proud member of the Odoo Community Association.
We are an OCA member and contributor. eYssen also builds on work from Camptocamp, Akretion, Noviat, MuK IT and many other open-source contributors.
Let's build something
smart together
Whether you're planning a new project or just exploring options, get in touch.
